<div>hi all :</div>
<div>    i face a problem during calculation phonon at G point process. the error  is following :</div>
<div> </div>
<div>  Representation # 19 mode #  19</div>
<div>     Self-consistent Calculation</div>
<div>      iter #   1 total cpu time :  3876.6 secs   <a href="http://av.it">av.it</a>.:   3.9<br>      thresh= 0.100E-01 alpha_mix =  0.700 |ddv_scf|^2 =  0.412E-07</div>
<div>      iter #   2 total cpu time :  3896.1 secs   <a href="http://av.it">av.it</a>.:  10.3<br>      thresh= 0.203E-04 alpha_mix =  0.700 |ddv_scf|^2 =  0.891E-09</div>
<div>      iter #   3 total cpu time :  3918.1 secs   <a href="http://av.it">av.it</a>.:  12.9<br>      thresh= 0.298E-05 alpha_mix =  0.700 |ddv_scf|^2 =  0.155E-08</div>
<div>      iter #   4 total cpu time :  3939.5 secs   <a href="http://av.it">av.it</a>.:  11.9<br>      thresh= 0.394E-05 alpha_mix =  0.700 |ddv_scf|^2 =  0.415E-11<br>     kpoint   7 ibnd  17 solve_linter: root not converged  NaN</div>

<div> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%<br>     from broyden : error #         3<br>     factorization<br> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%</div>

<div>     stopping ...</div>
<div> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%<br>     from broyden : error #         3<br>     factorization<br> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%</div>

<div>     stopping ...</div>
<div> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%<br>     from broyden : error #         3<br>     factorization<br> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%</div>

<div>     stopping ...<br>the error is in the 19th phonon calculation ,before is OK.</div>
<div>SO i do not know what happened. i need your help.<br clear="all"><br>-- <br>Xu Yuehua<br>physics Department of Nanjing university<br>China<br></div>